<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>
    <style>
        .box{
            width: 300px;
            height: 300px;
            border: 1px solid #000;
        }
    </style>
</head>
<body>
    <div class="box">
     <script>
        const oBox=document.querySelector('.box')
        //鼠标移动事件 的 lodash的使用
      /* function center(e) {
        console.log("center");
        console.log(e);
        console.log(this);
      }
      oBox.onmousemove = _.throttle(center, 300); */

      function enter() {
        this.style.background = "red";
      }

      function leave() {
        this.style.background = "";
      }
      oBox.onmouseenter = _.throttle(enter, 3000, {
        //lodash的节流提供两个配置,
       //leading控制节流返回的回调函数是否在初始的时候触发,
        //trailing控制节流返回的回调函数是否在最后也触发
        //如果一直停留trailing true  则也会触发 
        //还有一种情况就是你三秒内移入过 你鼠标在旁边也会触发
        leading: true,
        trailing: false,
      });
      oBox.onmouseleave = leave;
     </script>
    </div>
    

</body>
</html>